How many Carbon Cars are there in Burnout Paradise?

There are 6 Carbon cars in Burnout Paradise.

Krieger Carbon UBERSCHALL 8 -  (completed 2 full sets of online freeburn challenges)
Montgomery Carbon Hawker - (all billboards)
Carson Carbon GT Concept - (all smashes)
Jansen Carbon X12 - (all super jumps)
Kitano Carbon Hydros Custom - (beat all Showtime Road Rules)
Nakmura Carbon Ikusa GT - (beat all Time Road Rules)